CN109873408A - A kind of substation quickly isolates device and partition method with D. C. power source breakdown - Google Patents
A kind of substation quickly isolates device and partition method with D. C. power source breakdown Download PDFInfo
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Abstract
The invention discloses a kind of substations to quickly isolate device with D. C. power source breakdown, and the isolating device is series at DC power supply and direct current is fed out between branch, and every direct current, which is fed out, is equipped with the isolating device between branch and DC power supply；The input terminal of isolating device is connect with DC power supply, and the output end of isolating device connects DC load；The isolating device includes single chip machine controlling circuit, driving circuit, IGBT module, power electronics breaker, ground fault detection circuit and isolating diode；The control signal output of single chip machine controlling circuit after driving circuit isolation amplification with the control signal input of IGBT module and power electronics breaker by connecting；When device is in direct current normal mode of operation, single chip machine controlling circuit turns off the PWM drive signal of power electronics breaker, is powered by IGBT module directly to DC load；When device is in DC Line Fault operating mode, single chip machine controlling circuit turns off the driving signal of IGBT module, is powered by power electronics breaker to DC load.
Description
Technical field
The present invention relates to a kind of substations to quickly isolate device and partition method with D. C. power source breakdown, further relate to it is above-mentioned every
Partition method from device, belongs to technical field of electric power automation.
Background technique
Transforming plant DC power supply is the important component of transformer station secondary system, is the base of electric power system control and protection
Plinth, while being also to ensure that the guarantee that accident can be handled quickly.When DC power supply breaks down, gently then relay protection or stable
Device tripping, it is heavy then cause substantial equipment damage or substation's full cut-off, cause great economy to damage to power grid enterprises and national economy
It loses.
For now, transforming plant DC power-supply system monitors the operation shape of direct current system by insulating monitor
State, realizes the alarm of DC Line Fault, and the DC bus of DC power system feeds out branch with each direct current by breaker and is connected.
If certain direct current feeds out branch and DC ground fault occurs in transformer station direct current system, feeding out breaker will not trip, insulation prison
Device is examined although and may be implemented the detection and alarm to above-mentioned DC Line Fault, but corresponding DC ground fault can transmit rapidly
To entire direct current system, entire direct current system is caused ground fault occur, cannot achieve the isolation of ground fault.Therefore a kind of energy
The exploitation that the isolating device that each direct current feeds out grounding failure is enough isolated is necessary.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of substations to quickly isolate device with D. C. power source breakdown, should
Isolating device can be realized in transforming plant DC power-supply system failure between DC bus and direct current branch quickly isolate and
Failure quickly isolates between different direct current branch, so that the leapfrog for effectively preventing the DC Line Fault of DC power system passes
It passs, reduces the range of failure influence, guarantee the safe and stable operation of transforming plant DC power-supply system.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows:
A kind of substation quickly isolates device with D. C. power source breakdown, and the isolating device is series at DC power supply and direct current
It feeds out between branch, every direct current feeds out and is equipped between branch (each direct current feeds out parallel with one another between branch) and DC power supply
The isolating device；The input terminal of isolating device is connect with DC power supply, and the output end of isolating device connects DC load；It is described
Isolating device includes single chip machine controlling circuit, driving circuit, IGBT module, power electronics breaker, ground fault detection circuit
And isolating diode；The control signal output of single chip machine controlling circuit by driving circuit isolation amplification after with IGBT module
It is connected with the control signal input of power electronics breaker；When device is in direct current normal mode of operation, single-chip microcontroller control
Circuit turns off the PWM drive signal of power electronics breaker, is powered by IGBT to DC load；When device is in DC Line Fault
When operating mode, single chip machine controlling circuit turns off the driving signal of IGBT, is powered by power electronics breaker to DC load.
Wherein, when device is in direct current normal mode of operation, the output end of DC bus and the input terminal of IGBT module
The output end of connection, IGBT module is connect by isolating diode with DC load；When device is in DC Line Fault operating mode
When, the output end of DC bus is connect with the input terminal of power electronics breaker, the output end of power electronics breaker by every
It is connect from diode with DC load.
Wherein, the isolating device further includes failure alarm circuit, and failure alarm circuit is connect with single chip machine controlling circuit.
Wherein, the single-chip microcontroller model STM32F101RBT that single chip machine controlling circuit uses comprising input voltage sampling
Port AN0, output voltage sample port AN2 export current sample port AN1 and feed out in branch direct current positive and negative busbar over the ground
Voltage sample port AN4, AN5, further include PWM1, PWM2 and PWM3 signal driving end, PWM1 and PWM2 signal driving end is used for
The turn-on and turn-off of power electronics breaker two metal-oxide-semiconductors QA and QB are controlled, PWM3 signal driving end is for controlling leading for IGBT
Logical and shutdown.
Wherein, driving circuit include three tunnel drive signal circuits, the signal input part of three tunnel drive signal circuits respectively with
SCM PWM 1, PWM2 with PWM3 signal driving end connect, the drive signal circuit connecting with 1 signal of SCM PWM driving end
Driving signal PWMA-G and PWMA-S and power electronics breaker metal-oxide-semiconductor QA driving end be connected, with the drive of 2 signal of SCM PWM
The driving signal PWMB-G and PWMB-S and power electronics breaker metal-oxide-semiconductor QB of the drive signal circuit of moved end connection drive end phase
Even, the driving signal PWM-G and PWM-E for the drive signal circuit connecting with 3 signal of SCM PWM driving end are IGBT module
Driving control signal.
Above-mentioned substation quickly isolates the partition method of device with D. C. power source breakdown, specifically: single-chip microcontroller passes through ground connection
Fault detection circuit samples direct current in real time and feeds out positive and negative busbar voltage-to-ground in branch, and by sampled data be sent to single-chip microcontroller into
Row data processing and calculating carry out the output of corresponding driving signal according to calculated result, when there is positive electrode bus or negative electrode bus
When ground fault, system operating mode is switched to DC Line Fault operating mode, the drive of the complementary conducting of single-chip microcontroller output by single-chip microcontroller
Dynamic signal PWM1 and PWM2, control power electronics breaker metal-oxide-semiconductor QA and QB alternate conduction, continue to power to DC load, real
Existing ground fault isolation (the faulty powered operation mode of direct current), is simultaneously emitted by the alarm signal of corresponding failure branch；When not having
When there is ground fault, system operating mode is switched to direct current normal mode of operation by single-chip microcontroller, and single-chip microcontroller provides control signal
IGBT module conducting is driven, DC power supply is transferred to DC load (direct current fault-free powered operation mode) by IGBT module.
Power electronics breaker metal-oxide-semiconductor QA and QB alternate conduction ability inverse of the DC into AC, become by isolation
Depressor carries out voltage transformation, then becomes direct current electricity output through over commutation；Power electronics breaker mainly pass through metal-oxide-semiconductor and every
From the Fault Isolation that transformer realizes output end and input terminal, i.e. branch failure does not interfere with DC power supply, will not
Influence other branches.
Wherein, single-chip microcontroller carries out the meter of positive and negative busbar insulation against ground resistance according to the sampled value of positive and negative busbar voltage-to-ground
It calculates, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-；By obtained resistance value and the positive and negative mother set in program
Line insulation against ground resistance alarm threshold value is compared, and positive and negative busbar insulation against ground resistance alarm threshold value distinguishes R+_SET and R-_
SET works as R+When < R+_SET, single-chip microcontroller report positive bus-bar insulation decline failure；Work as R-< R-When _ SET, single-chip microcontroller report negative busbar is exhausted
Edge declines failure.
Wherein, single-chip microcontroller sampling positive and negative busbar voltage-to-ground data carry out the calculating of positive and negative busbar insulation against ground resistance,
Calculating process is as follows, wherein R1=R3, R2=R4, R5=R6；
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
It is exhausted over the ground to carry out positive and negative busbar using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground for single-chip microcontroller
The calculating of edge resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-。
Compared with the prior art, technical solution of the present invention has the beneficial effect that
What isolating device of the present invention not only may be implemented conventional circuit breaker cut-offs function, can also realize the fast of DC Line Fault
Failure is limited in the branch to break down by fast isolation features, is not transferred to DC bus side and other direct current branch, real
Quickly isolating for failure is showed, to improve the reliability and security of transforming plant DC power-supply system work.
Detailed description of the invention
Fig. 1 is the systematic schematic diagram that D. C. power source breakdown of the present invention quickly isolates device；
Fig. 2 is power electronics breaker circuit schematic diagram；
Fig. 3 is that direct current feeds out grounding fault detection schematic diagram；
Fig. 4 a is the circuit diagram for the drive signal circuit for driving end to connect with 1 signal of SCM PWM；
Fig. 4 b is the circuit diagram for the drive signal circuit for driving end to connect with 2 signal of SCM PWM；
Fig. 4 c is the circuit diagram for the drive signal circuit for driving end to connect with 3 signal of SCM PWM；
Fig. 5 is single chip machine controlling circuit schematic diagram；
Fig. 6 is direct current positive and negative busbar insulation against ground resistance calculations flow chart；
Fig. 7 is the control flow chart of single-chip microcontroller of the present invention.
Specific embodiment
According to following embodiments, the present invention may be better understood.However, as it will be easily appreciated by one skilled in the art that real
It applies content described in example and is merely to illustrate the present invention, without sheet described in detail in claims should will not be limited
Invention.
As shown in Figure 1, substation of the present invention quickly isolates device with D. C. power source breakdown, isolating device is series at direct current
Source and direct current are fed out between branch, every direct current feed out branch (each direct current feeds out parallel with one another between branch) and DC power supply it
Between be equipped with isolating device of the present invention；The input terminal of isolating device is connect with DC power supply, and the output end connection of isolating device is straight
Current load；Isolating device includes single chip machine controlling circuit, driving circuit, IGBT module, power electronics breaker, ground fault inspection
Slowdown monitoring circuit and isolating diode；The control signal output of single chip machine controlling circuit by driving circuit isolation amplification after with
IGBT module is connected with the control signal input of power electronics breaker；It is single when device is in direct current normal mode of operation
Piece machine control circuit turns off the PWM drive signal of power electronics breaker, is powered by IGBT directly to DC load；It is straight at this time
The input terminal of the output end and IGBT module that flow bus connects, and the output end of IGBT module passes through isolating diode and DC load
Connection；When device is in DC Line Fault operating mode, single chip machine controlling circuit turns off the driving signal of IGBT, passes through electric power electricity
Sub- breaker is powered to DC load；The output end of DC bus is connect with the input terminal of power electronics breaker at this time, electric power
The output end of electronic circuit breaker is connect by isolating diode with DC load.
Fig. 2 is the circuit diagram of power electronics breaker, and Uin is the input voltage of power electronics breaker, and Uout is
The output voltage of power electronics breaker, C1 and C2 are input capacitance, and power tube QA and QB are metal-oxide-semiconductor, the driving signal of metal-oxide-semiconductor
Carry out driving circuit, Tr is high-frequency isolation transformer, and L is outputting inductance, and D1 and D2 are fast-recovery commutation diode；D3 and D4 are
Two signals driving end of isolating diode, the PWM1 and PWM2 of single-chip microcontroller is connected with the port PWM1 and PWM2 of driving circuit,
The drive of two driving signals PWM1 and PWM2 after the transformation of overdrive circuit with power electronics breaker two metal-oxide-semiconductors QA and QB
Moved end is connected respectively, and by controlling the turn-on and turn-off of metal-oxide-semiconductor QA and QB, realizes the on-off control to power electronics breaker
System.Single-chip microcontroller changes the turn-on time of power tube in power electronics breaker by changing the turn-on time of PWM drive signal, most
The adjusting to output voltage is realized eventually, keeps the stabilization of output voltage.
Fig. 3 is the detection principle diagram that direct current feeds out grounding therefore detection circuit, and the power supply of direct current 220V is power electronics
The output voltage of breaker installs additional an isolating diode (D1 and D2) respectively on positive and negative busbar, this isolating diode is general
Logical rectifier diode；S1 and S2 is electronic switch, and R1 and R3 are balance resistor bridge, and R2 and R5 are positive Bus Voltage detection
Resistance, C1 are filter capacitor, and R4 and R6 are negative Bus Voltage detection resistance, and C2 is filter capacitor, and D3 and D4 are positive respectively
Negative busbar voltage-to-ground samples voltage limiting diode, and U+ and U- are positive and negative busbar sampled voltage over the ground, the sampled voltage point of U+ and U-
It is not sent to AN4 the and AN5 sample port of single chip machine controlling circuit.
Fig. 4 is the schematic diagram of driving circuit, and driving circuit includes three tunnel drive signal circuits, three tunnel drive signal circuits
The signal input part of (corresponding diagram 4a~Fig. 4 c) is connect with SCM PWM 1, PWM2 and PWM3 signal driving end respectively；It drives on three tunnels
Driving current-limiting resistance, respectively R1, R2 and R5 are equipped in dynamic signal circuit, driving signal, which is isolated, amplifies optocoupler, respectively U1,
U2 and U3, driving power, respectively+12V ,+12V and+15V, driving signal filter capacitor, respectively C1, C2 and C3, driving electricity
Resistance, respectively R3, R4 and R6, driving protection voltage-stabiliser tube, respectively VD1, VD2 and VD3；Wherein, it is driven with 1 signal of SCM PWM
The driving signal PWMA-G and PWMA-S and power electronics breaker metal-oxide-semiconductor QA of the drive signal circuit of moved end connection drive end phase
Even, the driving signal PWMB-G and PWMB-S and power electronics for the drive signal circuit being connect with 2 signal of SCM PWM driving end
Breaker metal-oxide-semiconductor QB drives end to be connected；The driving signal for the drive signal circuit being connect with 3 signal of SCM PWM driving end
PWM-G and PWM-E is the driving control signal of IGBT module.
Fig. 5 is single chip machine controlling circuit schematic diagram, and the model STM32F101RBT, Ui of single-chip microcontroller are input voltage sampling
Port AN0, Uos are output voltage sample port AN2, and Ios is output current sample port AN1, and Y indicates that crystal oscillator, C1, C2 are crystalline substance
Shake capacitor, and AN3 is temperature sampling port, and AN4, AN5 are to feed out direct current positive and negative busbar voltage-to-ground sample port in branch, adopts
Direct current positive and negative busbar of the sample input voltage in Fig. 3 sampled voltage (U+ and U-) over the ground, PWM1 the and PWM2 signal of single-chip microcontroller
Driving end is used to control the turn-on and turn-off of two metal-oxide-semiconductors QA and QB of power electronics breaker, the PWM3 signal driving of single-chip microcontroller
End is used to control the turn-on and turn-off of IGBT.The port 485R, 485T and 485C of single-chip microcontroller is RS-485 communication interface, monolithic
Machine is realized by its SPI communication interface (SDI, SCK, SDO) and human-computer interaction interface and is communicated.
Above-mentioned substation quickly isolates the partition method of device with D. C. power source breakdown, specifically: single-chip microcontroller passes through ground connection
Fault detection circuit samples direct current in real time and feeds out positive and negative busbar voltage-to-ground in branch, and by sampled data be sent to single-chip microcontroller into
Row data processing and calculating carry out the output of corresponding driving signal according to calculated result, when there is positive electrode bus or negative electrode bus
When ground fault, single-chip microcontroller provides control signal control power electronics breaker work (the faulty powered operation mode of direct current),
It is simultaneously emitted by the alarm signal of corresponding failure branch；When there is not ground fault, single-chip microcontroller provides control signal driving
IGBT module conducting, DC power supply are transferred to DC load (i.e. direct current fault-free powered operation mode) by IGBT module.
Isolating device of the present invention feeds out positive and negative busbar voltage-to-ground in branch by being grounded event detection circuit acquisition, and direct current is female
The sampled data of low-voltage is sent in single chip machine controlling circuit by line high voltage after decompression, filtering and pressure limiting processing
AD samples pin, and single-chip microcontroller is sampled by AD, and analog quantity is converted into digital quantity, then passes through software filtering and data processing,
Single-chip microcontroller obtains the digital quantity U of final positive and negative busbar voltage-to-ground sampled data+_ AD and U-_AD。
In Fig. 3, after isolating device of the present invention works normally, single-chip microcontroller real-time sampling positive and negative busbar voltage-to-ground data are come
The calculating of positive and negative busbar insulation against ground resistance is carried out, calculating process is as follows, wherein Ri=R3, R2=R4, R5=R6
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
It is exhausted over the ground to carry out positive and negative busbar using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground for single-chip microcontroller
The calculating of edge resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R_.Positive and negative mother is set in software program
Line insulation against ground resistance alarm threshold value, difference R+_SET and R-_SET；Work as R+When < R+_SET, under the insulation of single-chip microcontroller report positive bus-bar
Failure drops；Work as R-When < R-_SET, single-chip microcontroller report negative busbar insulation decline failure；The insulation of single-chip microcontroller moment monitoring DC bus
Situation realizes failure real time alarm function, and records failure and the moment occurs, while direct current normal mode of operation is switched to direct current
Fail operation mode guarantees the continuity of branch load power supply.
The basic principle of the method for the present invention:
DC Line Fault isolation and power supply when failure realize that direct current is defeated by turning on and off for power electronics breaker
The transformation and pressure stabilizing of voltage out guarantees the stabilization of branch direct current supply voltage when DC Line Fault；In addition, passing through control power electronics
Breaker rapidly switches off to be switched fast fault current, while realizing direct current event using the isolation features of power electronics breaker
Barrier quickly isolates；
Normal power supply when direct current fault-free, i.e., in the case of no DC Line Fault, by turning off power electronics breaker
PWM drive signal improve the power supply efficiency of system by IGBT directly to direct current branch load supplying；
DC Line Fault Detection & Controling, monitored on-line by DC Line Fault measure loop DC loop fault message and
Fault type exports different control driving signals, i.e., according to the different type of branch DC Line Fault according to DC Line Fault type
By normal power supply loop switch to Fault Isolation circuit, quickly isolating and continuing to mention to fault branch for DC Line Fault is realized
It is supported for electric power, after failure removal, current supply circuit is switched to normal loop power supply again by the control signal of control section.
Apparatus of the present invention are loaded by direct current normal power supply circuit to direct current branch at normal work (no DC Line Fault)
Power supply (increases output power), when single-chip microcontroller detects that branch has DC Line Fault, control DC Line Fault isolation mode starting, and control
Direct current normal mode of operation cutting processed, realizes quickly isolating and ensureing directly when DC Line Fault occurs in DC power system branch
The continuity of current load power supply.The voltage-to-ground that branch positive and negative busbar is monitored by DC Line Fault sample circuit, by hits
It according to the AD sample port for being sent to single-chip microcontroller, is handled by single-chip microcontroller internal data and data calculates, obtain positive and negative busbar over the ground
Insulation resistance numerical value realizes the real-time monitoring to branch trouble；According to the calculated result of single-chip microcontroller, controller issues Working mould
Formula controls signal, and the switching of Lai Shixian operating mode guarantees the safe and stable operation of DC power system.
Apparatus of the present invention are realized by power electronics breaker to the mapping function of DC voltage, and electronic power switch is passed through
(IGBT module) realizes the normal power supply function to DC loop, and the prison to D. C. power source breakdown is realized in DC Line Fault monitoring part
It surveys and calculates, while DC loop powering mode is controlled according to the fail result of calculating, Fault Isolation is quickly switched by normal power supply
Mode power realize to DC Line Fault quickly isolate and continued power function.
Claims (8)
1. a kind of substation quickly isolates device with D. C. power source breakdown, it is characterised in that: the isolating device is series at direct current
Power supply and direct current are fed out between branch, and every direct current, which is fed out, is equipped with the isolating device between branch and DC power supply；Isolation
The input terminal of device is connect with DC power supply, and the output end of isolating device connects DC load；The isolating device includes monolithic
Machine control circuit, driving circuit, IGBT module, power electronics breaker, ground fault detection circuit and isolating diode；It is single
The control signal output of piece machine control circuit by driving circuit isolation amplification after with IGBT module and power electronics breaker
Control signal input connection；When device is in direct current normal mode of operation, single chip machine controlling circuit turns off power electronics
The PWM drive signal of breaker is powered by IGBT to DC load；When device is in DC Line Fault operating mode, monolithic
Machine control circuit turns off the driving signal of IGBT, is powered by power electronics breaker to DC load.
2. substation according to claim 1 quickly isolates device with D. C. power source breakdown, it is characterised in that: at device
When direct current normal mode of operation, the output end of DC bus and the input terminal of IGBT module are connected, the output end of IGBT module
It is connect by isolating diode with DC load；When device is in DC Line Fault operating mode, the output end of DC bus with
The input terminal of power electronics breaker connects, and the output end of power electronics breaker is connected by isolating diode and DC load
It connects.
3. substation according to claim 1 quickly isolates device with D. C. power source breakdown, it is characterised in that: the isolation
Device further includes failure alarm circuit, and failure alarm circuit is connect with single chip machine controlling circuit.
4. substation according to claim 2 quickly isolates device with D. C. power source breakdown, it is characterised in that: single-chip microcontroller control
The single-chip microcontroller model STM32F101RBT that circuit processed uses comprising input voltage sample port AN0, output voltage sampling end
Mouth AN2 exports current sample port AN1 and feeds out direct current positive and negative busbar voltage-to-ground sample port AN4, AN5 in branch, also
End is driven including PWM1, PWM2 and PWM3 signal, PWM1 and PWM2 signal driving end is for controlling power electronics breaker two
The turn-on and turn-off of metal-oxide-semiconductor QA and QB, PWM3 signal driving end are used to control the turn-on and turn-off of IGBT.
5. substation according to claim 4 quickly isolates device with D. C. power source breakdown, it is characterised in that: driving circuit
Including three tunnel drive signal circuits, the signal input part of three tunnel drive signal circuits respectively with SCM PWM 1, PWM2 and PWM3
Signal drives end connection, the driving signal PWMA-G of drive signal circuit that is connect with 1 signal of SCM PWM driving end and
PWMA-S is connected with the driving end of power electronics breaker metal-oxide-semiconductor QA, and the driving connecting with 2 signal of SCM PWM driving end is believed
The driving signal PWMB-G and PWMB-S of number circuit is connected with the driving end of power electronics breaker metal-oxide-semiconductor QB, with single-chip microcontroller
PWM3 signal drives the driving signal PWM-G and PWM-E of the drive signal circuit of end connection to believe for the drive control of IGBT module
Number.
6. the partition method that substation described in claim 5 quickly isolates device with D. C. power source breakdown, which is characterized in that tool
Body are as follows: single-chip microcontroller feeds out positive and negative busbar voltage-to-ground in branch in real time by ground fault detection circuit to sample direct current, and will
Sampled data is sent to single-chip microcontroller and carries out data processing and calculating, the output of corresponding driving signal is carried out according to calculated result, when out
When existing positive electrode bus or negative electrode bus ground fault, system operating mode is switched to DC Line Fault operating mode by single-chip microcontroller, single
The driving signal PWM1 and PWM2 of the complementary conducting of piece machine output, control power electronics breaker metal-oxide-semiconductor QA and QB alternate conduction, give
DC load continues to power, and is simultaneously emitted by the alarm signal of corresponding failure branch；When there is not ground fault, single-chip microcontroller will
System operating mode switches to direct current normal mode of operation, and single-chip microcontroller provides control signal driving IGBT module conducting, direct current
Source is transferred to DC load by IGBT module.
7. substation according to claim 6 quickly isolates the partition method of device with D. C. power source breakdown, feature exists
In: single-chip microcontroller obtains positive and negative according to the calculating of the sampled value of positive and negative busbar voltage-to-ground progress positive and negative busbar insulation against ground resistance
The resistance value of bus insulation against ground resistance is respectively R+And R-；By obtained resistance value and the positive and negative busbar insulation against ground set in program
Resistance alarm threshold value is compared, and positive and negative busbar insulation against ground resistance alarm threshold value distinguishes R+_SET and R-_SET, works as R+< R+_
When SET, single-chip microcontroller report positive bus-bar insulation decline failure；Work as R-When < R-_SET, single-chip microcontroller report negative busbar insulation decline failure.
8. substation according to claim 7 quickly isolates the partition method of device with D. C. power source breakdown, feature exists
Positive and negative busbar voltage-to-ground data are sampled to carry out the calculating of positive and negative busbar insulation against ground resistance in: single-chip microcontroller, and calculating process is such as
Under, wherein R1=R3, R2=R4, R5=R6；
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
Single-chip microcontroller carries out positive and negative busbar insulation against ground electricity using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground
The calculating of resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910245943.3A CN109873408B (en) | 2019-03-28 | 2019-03-28 | Direct-current power supply fault quick isolation device and isolation method for transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910245943.3A CN109873408B (en) | 2019-03-28 | 2019-03-28 | Direct-current power supply fault quick isolation device and isolation method for transformer substation |
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| CN110492451A (en) * | 2019-09-09 | 2019-11-22 | 山东泰开高压开关有限公司 | A kind of multiport DC line intersection's fault processing system and method |
| CN112564061A (en) * | 2020-11-19 | 2021-03-26 | 国网江苏省电力有限公司南通市海门区供电分公司 | Branch protection device for direct current system of transformer substation and protection method thereof |
| CN112564063A (en) * | 2020-11-25 | 2021-03-26 | 云南电网有限责任公司文山供电局 | Active grounding protection device of direct current ring network system and working method thereof |
| CN113820562A (en) * | 2021-09-08 | 2021-12-21 | 国电南瑞科技股份有限公司 | Low-voltage direct-current power distribution network fault processing system and method |
| CN114326867A (en) * | 2021-12-30 | 2022-04-12 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
| CN114720902A (en) * | 2022-04-07 | 2022-07-08 | 国网黑龙江省电力有限公司佳木斯供电公司 | Direct-current power supply fault rapid isolation system for transformer substation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114720902A (en) * | 2022-04-07 | 2022-07-08 | 国网黑龙江省电力有限公司佳木斯供电公司 | Direct-current power supply fault rapid isolation system for transformer substation |
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